Does blood transfusion invalidate fasting? A definitive Islamic guide
                                
                                
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                                    4 min read                                
                            
                                According to a fatwa from Egypt's Dar Al-Ifta, a blood transfusion does not invalidate fasting, provided it does not have a debilitating effect on the person fasting. This widely held view is based on the interpretation that it is a medical treatment, not food or drink taken by mouth, and therefore does not break the fast.